From 45b70947a425fa121a8b9bcbb77472d9e35def6a Mon Sep 17 00:00:00 2001 From: Chao Yu Date: Tue, 16 Sep 2025 16:52:43 +0800 Subject: [PATCH] f2fs: add sanity check on ei.len in __update_extent_tree_range() Add a sanity check in __update_extent_tree_range() to detect any zero-sized extent update. Signed-off-by: wangzijie Signed-off-by: Chao Yu Signed-off-by: Jaegeuk Kim --- fs/f2fs/extent_cache.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/fs/f2fs/extent_cache.c b/fs/f2fs/extent_cache.c index ba0a07bfd3463..33e09c453c703 100644 --- a/fs/f2fs/extent_cache.c +++ b/fs/f2fs/extent_cache.c @@ -670,6 +670,15 @@ static void __update_extent_tree_range(struct inode *inode, if (!et) return; + if (unlikely(len == 0)) { + f2fs_err_ratelimited(sbi, "%s: extent len is zero, type: %d, " + "extent [%u, %u, %u], age [%llu, %llu]", + __func__, type, tei->fofs, tei->blk, tei->len, + tei->age, tei->last_blocks); + f2fs_bug_on(sbi, 1); + return; + } + if (type == EX_READ) trace_f2fs_update_read_extent_tree_range(inode, fofs, len, tei->blk, 0); -- 2.47.3